Timothy J. Trull, Ph.D., is professor of psychological sciences at the University of Missouri. Dr. Trull received his Ph.D. from the University of Kentucky and completed his internship at New York Hospital Cornell Medical Center. His research interests are in the areas of diagnosis and classification of mental disorders; borderline personality disorder; substance use disorders; clinical assessment; professional issues in clinical psychology; and ambulatory assessment methods. Dr. Trull has received several awards and honors for his teaching and mentoring, including Psi Chi Professor of the Year, the Robert S. Daniels Junior Faculty Teaching Award, and most recently the MU Graduate Faculty Mentor Award. He enjoys teaching Abnormal Psychology and Introduction to Clinical Psychology; his textbook, CLINICAL PSYCHOLOGY, is used in classes across the U.S. and internationally. A licensed psychologist, Dr. Trull continues to train future clinical psychologists in the assessment, prevention, and treatment of psychological disorders. Christopher A. Kearney is Distinguished Professor of Psychology at the University of Nevada, Las Vegas (UNLV). Dr. Kearney's research interests include school attendance problems, selective mutism, post-traumatic stress disorder in maltreated youth, perfectionism and other anxiety-related conditions in children and adolescents as well as issues of quality of life in persons with severe handicaps. The author of several books and numerous book chapters and journal articles on these topics, Dr. Kearney also conducts workshops for school districts and mental health and other agencies regarding school attendance problems and selective mutism. A fellow of the American Psychological Association (Division 12; Clinical Psychology), he is a recipient of the William Morris Award for Scholarship, the Barrick Scholar Award, the Barrick Distinguished Scholar Award, the Harry Reid Silver State Research Award, the Distinguished Teaching Award, the Outstanding Graduate Faculty Award,and the Academic Advisor Award-Graduate from the University of Nevada, Las Vegas. Dr. Kearney received his B.A. in psychology and sociology from the State University of New York at Binghamton and his M.A. and Ph.D. in psychology from the State University of New York at Albany. He completed his internship at the University of Mississippi Medical Center before moving to Las Vegas.